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Opt Lett. 2003 Jun 15;28(12):995-7.

Fiber bragg gratings made with a phase mask and 800-nm femtosecond radiation.

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  • 1Communications Research Centre Canada, 3701 Carling Avenue, PO Box 11490, Station H, Ottawa, Ontario K2H 8S2, Canada.


High-quality retroreflecting fiber Bragg gratings were written in standard Ge-doped telecom fiber (Corning SMF-28) after a few minutes exposure with pulsed 800-nm, 120-fs laser radiation by use of a deep-etch silica zero-order nulled phase mask optimized for 800 nm. Induced index modulations of 1.9 x 10(-3) were achieved with peak power intensities of 1.2 x 10(13) W/cm2 without any fiber sensitization. The fiber gratings are stable and did not erase after 2 weeks at 300 degrees C. The primary mechanism of induced index change results from a structural modification to the fiber core.

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